/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * <http://www.mongodb.com/licensing/server-side-public-license>.
 */
package org.graylog2.shared.bindings;

import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
import com.google.inject.Stage;

import java.util.List;

public final class GuiceInjectorHolder {
    private static Injector injector;

    private GuiceInjectorHolder() {
    }

    public static Injector createInjector(final List<Module> bindingsModules) {
        if (injector == null) {
            injector = Guice.createInjector(Stage.PRODUCTION, bindingsModules);
        }

        return injector;
    }

    public static void setInjector(Injector injector) {
        GuiceInjectorHolder.injector = injector;
    }

    public static void resetInjector() {
        injector = null;
    }

    public static Injector getInjector() {
        if (injector == null) {
            throw new IllegalStateException("No injector available. Please call createInjector() first.");
        }

        return injector;
    }
}
